Add cluster replication features and membership management
- Introduced a new `ClusterManager` to handle cluster membership events and facilitate event replication across relay peers. - Implemented HTTP endpoints for retrieving the latest serial and fetching events within a specified range. - Enhanced event handling to process cluster membership events (Kind 39108) and update relay lists accordingly. - Updated configuration to support cluster administrators and their management capabilities. - Added comprehensive tests to validate the new cluster replication functionalities. - Documented the cluster replication protocol in a new specification file. - Bumped version to reflect these changes.
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